A circle, for rooms a rectangle won't fit.
SYLARA is 49 inches across and has no long axis, which means it has no wrong orientation. Put it in a corner, under a window, in the middle of the floor — it looks placed on purpose rather than squeezed in. For a small bathroom or an awkward alcove, that freedom is worth more than length.
Bathing in a round tub is a different posture: knees drawn up, back against the wall, water at the chest. With a 16.9-inch interior you sit shoulder-deep rather than lying flat. That's the trade a Japanese-style soak makes — less room to stretch, more of you underwater, and a bath that feels enveloping rather than open.
The round solid surface form creates a substantial, sculptural presence. The rim has a comfortable feel as you enter and leave the tub, and the material helps the water hold its heat well for a tub of this volume.
One thing to plan for: at 49 inches across, this tub will not go through a standard interior door.