I like to start with the actual model, and then use the sketch as an aid to realize the future model step by step.
(There is further explanation in the picture)
I imagine that in this base, it will be a building to serve tourists for leisure and entertainment. By combining the two axes of the base, a building is placed in the base and the stairs are developed into an up-and-down leisure and entertainment building. The main purpose is to let the two sides of the staircase bend freely, and this bend can play a lot of changes: increase the width, the complexity of the profile, and finally let the staircase become the floor, and sandwich the main volume, in which the most exaggerated staircase will be a slope that extends all the way from the ground to the roof.
In order to make the building more interactive with the base, a tower is designed with the same volume. The tower provides visual balance and connects the various parts of the site. The building is a ramp building without stairs, so the routes are more horizontal and circuitous, but the office connection connects all the routes vertically.