HI shaped by colorful rectangles

"HI" appears as the principal letterform constructed from stacked and interlocking rectangles that read clearly at portrait scale. The letters sit centered within a 9:16 vertical frame with generous top and bottom breathing space and a tight horizontal crop that favors bold negative margins. The word "HI" is rendered with high legibility, large scale, even letterspacing, and clean edges so each rectangle reads as a distinct block against its neighbors. Surfaces are flat and matte with subtle paper-like grain on key planes and a faint cast shadow that gives slight separation between layers. Light is soft and even with gentle directional shimmer that emphasizes the coral, warm yellow, aqua, cobalt blue, and violet hues in the palette. Depth is moderate with the foreground rectangles resolving crisply while layered planes recede softly into muted color fields. The viewpoint is straight-on and centered, producing a graphic, poster-like composition with balanced negative space at the sides. Include one small register mark or faint barcode cue near the lower edge as a contextual prop for print intent. Render as a clean vector illustration with crisp edges, flat color fills, and layered mask-like shapes. Convey a calm, confident energy through stable geometry and restrained color contrast.