[VERIFY: Peter’s direct connection to O’Callaghan at SVA, whether he studied under O’Callaghan directly or was influenced by his work/teaching through the program]

There was a moment in a crit at SVA where someone presented a model and Kevin O’Callaghan picked it up. Didn’t say anything first. Just picked it up, turned it over in his hands, held it at arm’s length, brought it close. Then he set it back down and asked the student: “Did you hold this before you brought it in?”

The student had not. They’d built it, photographed it for the presentation slides, and brought it to crit in a bag. O’Callaghan’s point was immediate. The object had been designed on a screen, constructed as a task, and evaluated through a photograph. Nobody had held it. Nobody had felt the weight, noticed that one edge was uncomfortable against the palm, discovered that the proportions that looked right at screen resolution felt wrong at hand scale.

This stuck with me for years, and the reason it stuck is that it named something I’d been sensing without language for it. There’s a dimension of design evaluation that requires physical presence. You have to be in the room with the thing. You have to hold it, walk around it, stand at different distances. The object changes depending on where you are in relation to it. A screen collapses all of that into a single, fixed viewpoint.

O’Callaghan ran the 3D Design program at SVA. His entire teaching practice was organized around this idea. Material is not an abstraction. Scale is not a number. The relationship between an object and a person is physical, spatial, and variable. You can spec a dimension. You can’t spec the feeling of picking something up and discovering it’s lighter than it looks. That surprise is a design property, and it only exists in the room.

I think about this constantly, even though most of my work now is digital. The lesson transferred. When I’m evaluating a website, I open it on my phone and hold it. I open it on a laptop at a coffee shop, with ambient light and noise and distraction. I print a page and pin it to the wall and look at it from across the room. These aren’t romantic gestures toward physicality. They’re evaluation contexts that reveal things the design tool can’t show me.

A button that looks perfectly sized in Figma at 100% zoom might feel too small when my thumb is hovering over it on a real phone, in a moving car, with one hand. A heading that reads fine on my studio monitor might disappear on a screen in direct sunlight. The evaluation changes depending on the body’s relationship to the object. O’Callaghan was teaching this about physical products, but the principle holds for anything that a human being encounters in space.

Scale is the one that catches people most often. There’s a reason architects build physical models. A floor plan at 1:100 scale tells you the dimensions. A physical model at 1:50 tells you something else entirely: how the space feels. Whether the ceiling height is oppressive or generous. Whether the corridor is comfortable or tight. Whether the room has a sense of arrival or just a sense of continuing. These are real properties of the design. They matter to the people who will live in the space. And they are invisible on a screen.

O’Callaghan’s pedagogy was built on this. Make the thing. Hold the thing. Walk around the thing. Then evaluate. Not because digital tools are inadequate (they’re extraordinary, I use them constantly), but because digital tools show you the design, and the design is not the experience. The experience is what happens when a person encounters the object in space, with a body, at a specific scale, under specific conditions.

The crit I mentioned, the one where he picked up the model, changed how I evaluate everything. Before that, I evaluated on screen. After that, I started asking: have I been in the room with this? Have I held it? Have I experienced it the way the person on the other end will experience it? And if I haven’t, I haven’t actually evaluated it. I’ve evaluated a representation of it, which is a different thing.

Most digital design practice has quietly dropped this dimension. We design on screens, present on screens, evaluate on screens, ship to screens. The entire chain is mediated. And the mediation feels transparent because we’re so used to it. But it’s not transparent. It’s lossy. Every step of mediation strips information about scale, weight, texture, spatial relationship, ambient context. The things O’Callaghan was teaching about.

I can’t always hold the thing. The work I do now is often abstract, protocol-level, structural. There’s nothing to pick up. But I can always ask the question: what would change about my evaluation if I could be in the room with this? What am I missing because I’m seeing a representation instead of the thing itself? And when I can get closer to the actual experience, through testing on real devices, in real contexts, with real people, the evaluation always improves.

O’Callaghan taught me that presence is a design dimension. I’m still working out all the ways that applies.